Coosa River vs river

Coosa River and river both are nouns.

Word	Noun	Adjective	Verb	Adverb
Coosa River	Yes	No	No	No
river	Yes	No	No	No

Coosa River (noun)	river (noun)
river that rises in northwestern Georgia and flows southwest through eastern Alabama to join the Tallapoosa River near Montgomery and form the Alabama River	a large natural stream of water (larger than a creek)